The sound level and config tool you speak of is called Retrovol. It is a handy app indeed. A little care is need in specifying the soundcard number - sometimes entering an incorrect number can crash it. In this case the soundcard number can be manually specified in the config file
/root/.retrovolrc

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another problem with multiple soundcards is they can load randomly in different order at boot.

This can be resolved by specifying the card's index in
/etc/modprobe.d/alsa-base.conf

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